Creamy Chicken Enchiladas

3TB butter
1/4 cup flour
1 1/2 cups chicken broth
1/2 cup chopped onion
2 cloves garlic, minced
1/2 cup salsa
1/2 cup sour cream
2-3 cups shredded chicken
shredded cheese

Preheat oven to 350. Lightly grease baking dish. In medium saucepan over medium heat, saute onion in the butter. Add garlic, and continue to saute. Add flour and mix until bubbly. Add chicken broth and salsa. Cook until thickish. Remove from heat and add sour cream. Mix some sauce and cheese with the chicken. Spread thin mixture of sauce in bottom of pan. Fill tortillas with chicken mixture and place in pan. Pour remaining sauce over filled tortillas, top with cheese, and bake for 30-35 minutes.